Beyond the difference in appearance, crochet and knit have many functional differences. Crocheted items are thicker than knit, making them more leak-proof. Knit is thinner, making it more hot weather friendly. The thickness of crochet makes it more durable in the long run. Knit starts to look thin after multiple shavings. Knit stretches mostly width-wise while crochet stretches more length-wise. Crochet uses more yarn to complete the same size project. The actual stitches of crochet are generally larger with larger spaces between stitches than knit. Knit stitches are smaller and closer together. Knitting can be done by machine, but crochet must be hand made. For crochet woolies, I would recommend something done in single crochet, half double crochet, or Tunisian crochet. For knitted longies, I would recommended something with 4 or more stitches per inch.